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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant | 10,155,000 | 7,835,000 |
Intrinsic value of options exercised | $ 800,000 | $ 5,200,000 | $ 1,000,000
Discretionary contributions of plan | 25.00% |  |
Percentage of contribution by eligible participants | 4.00% |  |
Maximum contribution per participant | 1,000 |  |
Defined contribution plan description | This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Harmonic can make discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Employer contributions were suspended from 2009 through 2012, but have been renewed, on the same basis, for 2013. |  |
Assumed Unvested Stock Option [Member] | Omneon [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of assumed options to be issued under the assumed acquisition stock plans | 1,522,000 |  |
Assumed unvested restricted stock units [Member] | Omneon [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of assumed options to be issued under the assumed acquisition stock plans | 1,455,000 |  |
2002 Director Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Price at which non-statutory stock options may be granted | Not less than 100% of the fair value |  |
Common stock reserved for issuance | 872,513 |  |
Shares available for grant | 350,912 |  |
Share based compensation arrangement vesting period | Both options and RSUs vest over a period of time as determined by the Board of Directors, generally three years for the initial grant and one year for subsequent grants to a non-employee director, and expire seven years from date of grant |  |
Exercise price of RSUs | $ 0 |  |
Reduced the number of shares reserved for every unit granted | 1.5 |  |
Increased number of shares reserved for every unit forfeited | 1.5 |  |
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for issuance | 1,230,891 |  |
Percentage of fair market value of Common Stock to purchase shares | 85.00% |  |
Range of payroll deduction | 1% to 10% |  |
Common stock issued under the 2002 ESPP | 1,598,895 | 945,287 | 864,800
Stock contributions value under 2002 ESPP | $ 6,400,000 | $ 5,200,000 | $ 4,200,000
Total number of shares issued under plan | 8,269,109 |  |
Other Stock Option Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for issuance | 306,882 |  |
1995 Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Price at which incentive stock options may be granted | Not less than 100% of the fair value |  |
Price at which non-statutory stock options may be granted | Not less than 85% of the fair value |  |
Maximum term of stock options granted | 7 years |  |
Decrease in plan reserve for every unit | 1.5 shares for every unit or share granted |  |
Increase in plan reserve for every unit | 1.5 shares for every unit or share forfeited |  |
Common stock reserved for issuance | 21,108,836 |  |
Shares available for grant | 9,804,018 |  |
Share based compensation arrangement vesting period | Vest over four years and expire seven years from date of grant. Options granted prior to February 2006 expire in ten years. |  |
1995 Stock Plan [Member] | Options and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum term of stock options granted | 10 years |  |
1995 Stock Plan [Member] | Options and Restricted Stock Units [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 3 years |  |
1995 Stock Plan [Member] | Options and Restricted Stock Units [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 4 years |  |
Assumed Omneon Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 4 years |  |
Maximum term of stock options granted | 10 years |  |
Common stock reserved for issuance | 702,512 |  |
Assumed Omneon Stock Options [Member] | Assumed Unvested Stock Option [Member] | Omneon [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of assumed options to be issued under the assumed acquisition stock plans | 1,522,000 |  |
Assumed Omneon Stock Options [Member] | Assumed unvested restricted stock units [Member] | Omneon [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of assumed options to be issued under the assumed acquisition stock plans | 1,455,000 |  |
Assumed Omneon Stock Options [Member] | Options and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 4 years |  |
Maximum term of stock options granted | 10 years |  |

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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6510416 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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